Electric-arc lamp.



w. RiI HLING. ELEGTRIG ARC LAMP.

APPLICATION FILED APR.11, 1911.

1,042,375. Patented Oct. 22, 1912'.

UNITED sTArEs PATENT onrroa;

WALDEMAR RI IHLING, OF BERLIN, GERMANY, ASSIGNOR T0 HERMAN N MALACI-IOWSKI,

' OF BERLIN, GERMANY.

ELECTRIC-ARC LAMP.

Specification of Letters Patent.

Patented Oct. 22, 1912.

Original application filed November 15, 1909, Serial No. 528,176. Divided and this application filed April tam new and useful Improvement in Elec-' trio-Arc Lamps, of which the following is a specification. v

The present invention relates to are lamps and particularly to candle lamps of the type in which the electrodesare arranged in parallel and mounted upon a base through which the current is led to the electrodes.

The special object of my invention is to provide suitable means for automatically exting'uishing the are before the electrodes are completely consumed, thus protecting the base from injury.

The present application is a division of my co-pending application Serial No. 528,176, filed November 15th, 1909.

' the type mentioned,-in which my invention is embodied, is shown in side elevation.

The lamp illustrated comprises a base X.

adapted to e screwed into an ordinary incandescent'lawp socket and through which the current is led to the electrodes 11 andb mounted in parallel on the base. Between,

the electrodes and throughout the greater portion of theirlength is interposed a tusible insulating barrier comprisin materials which upon the extinction of t e are fiorm a conducting bridge uniting the electrodes a and serving as a means for rekindling the Serial No. 620,407.

are when the lamp circuit is reestablished. Below'the substance 0 I mount upon thebase a heat resisting and nonconducting barrier s between the electrodes to serve as an automatic extin uisher of the are before the latter has su ciently closely approached the base to injure the latter.

The operation of the lamp is readily understood. If the lamp is burned after the electrodes a and b have been consumed down to a point on a level with the upper edge of the'barrier s, the arc is gradually lengthened, since in its passage from one electrode to the other, it must bridge the barrier s.

As the electrodes are further consumed, the length of the arc is necessarily increased, with the final result that the arc resistance becomes excessive and the lamp circuit is thereby automatically broken.

7 I claim as my invention: In the accompanying drawing a lamppf I In an arc lamp, a base, electrodes parallel throughout their length adjacently supporte thereon, and a stationary heat-resisting non-conductor arranged between said electrodes adjacent the base and serving to automatically extinguish .the lamp by lengthening the arc.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WALDEMAR RIlHLING. Witnesses:

HENRY Hasrnn,

RICHARD Gon'rz.

Copies of this patent may be obtained for flv e cents each, by addressing the Commissioner of Patents, Washington, I). 0. 

